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Stratospheric Background Aerosol (SBA) - Mean Vertical profiles of SBA: Vertical decrease in the number of particles at larger mode in the lower stratosphere [Thomason & Peter, 2006] Vertical decrease of the amount of carbonaceous aerosols in the lower stratosphere [Murphy et al., 2007] => How is the vertical profile of SAGE II Reff ? - Seasonal cycle in SBA: [Hitchman et al., 1994] Above 26 km, the enhanced uplift of aerosols in summer with the suppressed uplift or horizontal mixing in winter (contrast of winter vs summer) At 16-22 km, rapid horizontal transport and mixing => How is the role of microphysics and dynamics ? (Also how is the hemispheric difference and tropical variations ?)

3
Aerosol formation in tropical upper troposphere (TUT) - In UTU, cold temperature, much water in the cloud region => Aerosol formation: the production of OH, and consequently of gaseous H2SO4 Aerosol loss: the uptake of gaseous H2SO4 & SO2, and the homogeneous freezing of aerosol particles to form cirrus clouds However, the horizontal distribution of aerosols on the whole global in UTU is still unclear …

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